FULL PRODUCT VERSION :
java version "1.6.0_14-ea"
Java(TM) SE Runtime Environment (build 1.6.0_14-ea-b03)
Java HotSpot(TM) Client VM (build 14.0-b12, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
 customer  Windows 7 Ultimate x64, build 7057


A DESCRIPTION OF THE PROBLEM :
The name of the operating system is reported by System.getProperty ("os.version") as "Windows Vista" but it must be "Windows 7".

The same bug can be seen in recent builds of JDK 5.0 and JDK 6.0.



STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :


EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
OS = Windows 7
ACTUAL -
OS = Windows Vista

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
class OSVersion {
    public static void main(String[] args) {
        System.out.println ("OS =" + System.getProperty ("os.name"));
    }
}
---------- END SOURCE ----------
Posted Date : 2009-03-19 23:20:23.0

N/A

Need to examine minor version to distinguish Vista from Windows 7 (ie: 6.0 = Vista, 6.1 = Windows 7).
Posted Date : 2009-03-20 08:55:19.0

Running Windows 7 Ultimate beta with 
java version "1.6.0_13"
Java(TM) SE Runtime Environment (build 1.6.0_13-b03)
Java HotSpot(TM) Client VM (build 11.3-b02, mixed mode, sharing)

Test code:
---------- BEGIN SOURCE ----------
public class OSVersion2 {
	public static void main(String[] args) {
		System.out.println("OS: " + System.getProperty("os.name"));
		System.out.println("Version: " + System.getProperty("os.version"));
	}
}
---------- END SOURCE ----------

When running OSVersion2 through command prompt the output is:
OS: Windows Vista
Version: 6.1

When running the same class file through eclipse the output is:
OS: Windows XP
Version: 5.1

So it seems the os.version isn't reliable either. Great.